1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47d37a165bded812c83aeeb03d7260d21a0e8b8ed1c872e29bd6eac6a94db30. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/879a87ca-6e13-4b75-93a5-d7fdad4b0761.json and https://artists.proofprofile.net/proofs/artist/879a87ca-6e13-4b75-93a5-d7fdad4b0761.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188ca92186f2fdcd201c433238b4bbabd0e9d7c1ea4f2e24c1fe41a78547218a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN92416942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be82ea9d8e670595c75886efc193204521c9f717d1ce97c4c02d0c4e35bb655. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBB2422230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f45604dee709a341fee38a0598e40e6970a2dbab81e8501ca693733efa8a35. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFN2483734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb20737671d5db5e83b3e6ba7045d50761b2d45c3dd10c61d51f7b443c8f4f1d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7L2462302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74da30064bf052d7a8544d47dbb53a9c4baccef04f502dad666d373e675b47cb. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7L2462303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e24e92e7ce70fca88f34ad9afd5b0f41be7948d45466c47058c57a11128aa05. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7L2462304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3917059cc6a78ec606eb75602dd26c0cea30c034506240df4789c845e1c799b9. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7X2434027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c41120835b600079f244d1b639fe3bec694dcb6876764dcc6c47f1653e2ab2d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA42576530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f9a27b34dae55330ee0a86af82544833d81c11bcf702806f8ceaeace73ba25. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN32576213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ccaa996636682976d96b7e033134942f05484fee6145fadb25f952b024ec757. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN42537471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f9a27b34dae55330ee0a86af82544833d81c11bcf702806f8ceaeace73ba25. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN32576213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0dd1b24706dc8470649502cf5eddecd2357c7f3efddbe167f005b508d8d71e3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN42537470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe4b7cd2b1ef9128c150f5bd33e6b4615acf9fd7f01f717a6db33121f850cfa. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6H2514362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f69ff487c5e5c7b0fffc6eb4f157d50db26dc564960a02d88bc963d25a8ced. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZQAY2550854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746bd47d6f611ec8841bdaabf9dd4dbd178c2c63ae7e2079d346bf88f71015d3. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZQAY2512986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339279ebdc42ea09f232724a768e0c36c6fd72bc42907e2781477579860301d3. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZQAY2581077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff953e29acda02a840e1794d41eeb418b278294cfc3dc529ff624e3d35699e2. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZQAY2518336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489965ca66956923f3d9113282a5791a02f3c47e0f16c69b9a393038af1cdd6c. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZQAY2595649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25eca52fe156c785abf959ebde7a16e9676c23c0c4679b11b1ff96631f81b2cc. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS7J2596782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa186bdc1823c5e94a6d2952d197c325968dddcc062e7d82d16242abed9525fe8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZRP52499114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de4ead69e926cd00548b802eab720d8fa57f835f0d9bac942fec43f9d5cd13f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZRP42417923.